US902990A - Arc-lamp. - Google Patents

Arc-lamp. Download PDF

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US902990A
US902990A US38506507A US1907385065A US902990A US 902990 A US902990 A US 902990A US 38506507 A US38506507 A US 38506507A US 1907385065 A US1907385065 A US 1907385065A US 902990 A US902990 A US 902990A
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strip
lamp
spring
arc
pulley
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US38506507A
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Richard Philip Myers
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements

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  • This invention relates mainly to are lamps of the kind in which the regulating mechanism for the movable carbon or carbons is controlled by the thermal. expansion and contraction of a band, strip, wire or the like of suitable metal through which the current passes.
  • the said band or strip is liable to be damaged or destroyed by excessive currents more especially in cases where a number of lamps are run in series on constant potential mains.
  • one lamp of the series may remain unlighted with its carbons in contact with each other, this being due to such lamp requiring a heavier current than the others to operate its mechanism.
  • the current in the circuit (although not in the strips themselves) is maintained at a somewhat high value or is slightly increased by reason of the moving together of the carbons caused by the cooling of the strips when they are short-circuited, so as to cause the sluggishly acting lamp to strike its arc, this being done without incurring any risk of destroying the strips on the lighted lamps.
  • the expansible strip is moreover arranged in the form of a simple loop, the ends being secured by means of pins and eyes to a spring-controlled lever and a fixed block or terminal respectively'and the bend extending round an insulated or insulating Specification of Letters Patent.
  • the pulley which is mounted on an adjustable support so that, after placing the strip around the pulley and attaching its ends to the lever and terminal, the said strip can be drawn taut by suitably adjusting the support of said pulley.
  • Figure l is a side elevation of the lamp mechanism, parts being shown in section.
  • Fig. 2 is an elevation of said mechanism showing the opposite side to that illustrated in Fig. 1.
  • Fig. 3 is a detail View drawn to an enlarged scale showing part of the mechanism in Fig. 1.
  • Fig. 4% is an underside view of the parts shown in Fig. 3.
  • Fig. 5 is a detail View of the brake drum and chain looking from right to left of Fig. 1 and drawn to an enlarged scale.
  • a is the frame of the lamp, which comprises a tubular guide I) for the upper movable carbon holder 0 and an insulated fixed lower carbon holder (Z which is electrically connected by an insulated wire 6 to the in sulated terminal f.
  • the upper carbon holder 0 is connected by a flexible conductor 9 to the periphery of a pulley h rigidly mounted on an arbor which is rotatably mounted in brackets 70, 70 on the frame a and which also bears a fixed pulley m that has secured to its periphery a cord it having attached to its lower end a tubular weight 0 sliding on a guide pillar 29.
  • the said arbor is also provided with a fixed brake pulley (1 which coacts with a brake chain 1' that is attached at one end for example, by soldering to a Hat spring 8 mounted on the uppermost disk of the frame a and at the other end to one arm t of a lever t, u pivoted at o, '2) on the brackets 7a,
  • This chain preferably takes one turn round the pulley Q as shown.
  • the thermally expansible strip w which may consist of watch spring, is provided at its ends with eyes as, 03, one of which engages with a hook or pin y on an insulated terminal 2 mounted on the uppermost disk of the lamp frame, the other eye engaging with a hook or pin 3 on the arm a of the lever t, u.
  • the middle part of the strip 10 extends over a pulley 4L of insulating material, 6. g. porcelain, which is rotatably mounted in a fork 5 provided with a screw threaded extension 6 that extends through a hole in the lower frame-disk and coacts with a wing nut 7 whereby the tension of the strip m can be readily adjusted.
  • the strip '20 is thus arranged in two slightly convergent limbs and can be very readily removed by slacking the nut 7 and unhooking the eyes m, a: from the pins 7 3.
  • the end of the lever-arm a to which the strip to is attached preferably made in the form of a circular are substantially concentric with the pivots o of the lever 1, u, so as to increase the contact surface of said strip on said arm and to enable the pull of the strip to on the lever f. u, always to take place at substantially the same distance from the axis 4), a).
  • the lever-arm 25 is acted upon by a spring 8 in such a manner as to keep the strip in in tension.
  • the lower end of the spring 8 is secured to a sm'ew-threaded bolt extending through a hole in the lower frame-disk and provided with a wing nut 9, so as to enable the tension of the spring to be conveniently adjusted as required.
  • the strip 10 expands and the above described operations are repeated.
  • the insulated terminal 2 is provided with a spring contact tongue 10, the tree end of which during the normal operation of the lamp stands at a short distance from the spring s.
  • An electric contact 11 electrically connected to the terminal 7 is arranged on the side of the tongue 10 remote from the spring a and at ashort distance therefrom, By this means, if the strip to should break, the spring 8 is first drawn down into contact with the tongue 10 and then the tongue is brought into contact with the contact 11 whereupon the lamp is entirely short-oircuited.
  • hat I claim is 1.

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Description

R. P. MYERS.
ARC LAMP.
APPLICATION FILED JULY 22,1907.
Patented Nov. 3, 1908.
3 SHEETS-SHEET 1.
9 I; 21/206,820 Ric/La? a2? W1] 6 4 m'giessas 7m: NDRRIS PETERS ca, WASHINGTON, o. c.
R. P. MYERS.
ARC LAMP.
APPLICATION FILED JULY 22, 1907.
Patentd N0v.3, 1908.
3 SHEETS-SHEET 2.
W E y- 3, f d
THE NORRIS PETERS co., wnsnmaranl'. 0. c4
R. P- MYERS;
ARC LAMP. APPLICATION FILED JULY 22, 1907.-
Patented Nov. 3, 1908.
THE NORRIS Farms co., WASHING UNITED STATES PATENT OFFICE.
RICHARD PHILIP MYERS, OF WALTHAMSTOW, ENGLAND.
ABCLAMP.
To all whom it may concern:
Be it known that I, RICHARD PHILIP MYERs, a subject of the King of Great Britain, residing at Valthamstow, Essex, England, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.
This invention relates mainly to are lamps of the kind in which the regulating mechanism for the movable carbon or carbons is controlled by the thermal. expansion and contraction of a band, strip, wire or the like of suitable metal through which the current passes. In the arc lamps of this kind heretofore suggested, the said band or strip is liable to be damaged or destroyed by excessive currents more especially in cases where a number of lamps are run in series on constant potential mains. Moreover, when these lamps are so run, one lamp of the series may remain unlighted with its carbons in contact with each other, this being due to such lamp requiring a heavier current than the others to operate its mechanism. ow according to the present invention, in order to obviate these disadvantages, means are provided whereby the motion of the free end of the expansible band, strip or wire, hereinafter referred to shortly as the strip, controls the operation of a switch whereby the said strip is short-circuited when the temperature thereof becomes eX- cessive. This switch moreover, in cases where c. g. one lamp of a series on a constant potential circuit fails to strike an are when the current is turned on, prevents the remaining lighted lamps of the series from increasing the lengths of their arcs indefinitely to absorb the voltage in excess of what is required by the reduced number of lamps.
By means of the cut-outs above referred to, the current in the circuit (although not in the strips themselves) is maintained at a somewhat high value or is slightly increased by reason of the moving together of the carbons caused by the cooling of the strips when they are short-circuited, so as to cause the sluggishly acting lamp to strike its arc, this being done without incurring any risk of destroying the strips on the lighted lamps. The expansible strip is moreover arranged in the form of a simple loop, the ends being secured by means of pins and eyes to a spring-controlled lever and a fixed block or terminal respectively'and the bend extending round an insulated or insulating Specification of Letters Patent.
Application filed. July 22, 1907.
Patented Nov. 3, 1908.
Serial No. 385,065.
pulley which is mounted on an adjustable support so that, after placing the strip around the pulley and attaching its ends to the lever and terminal, the said strip can be drawn taut by suitably adjusting the support of said pulley. By this means, the number of joints in the electric circuit is reduced to a minimum and the strip can be very easily inserted in position and removed.
In the accompanying drawings, Figure l is a side elevation of the lamp mechanism, parts being shown in section. Fig. 2 is an elevation of said mechanism showing the opposite side to that illustrated in Fig. 1. Fig. 3 is a detail View drawn to an enlarged scale showing part of the mechanism in Fig. 1. Fig. 4% is an underside view of the parts shown in Fig. 3. Fig. 5 is a detail View of the brake drum and chain looking from right to left of Fig. 1 and drawn to an enlarged scale.
Like letters indicate corresponding parts throughout the drawings.
a is the frame of the lamp, which comprises a tubular guide I) for the upper movable carbon holder 0 and an insulated fixed lower carbon holder (Z which is electrically connected by an insulated wire 6 to the in sulated terminal f. The upper carbon holder 0 is connected by a flexible conductor 9 to the periphery of a pulley h rigidly mounted on an arbor which is rotatably mounted in brackets 70, 70 on the frame a and which also bears a fixed pulley m that has secured to its periphery a cord it having attached to its lower end a tubular weight 0 sliding on a guide pillar 29. The said arbor is also provided with a fixed brake pulley (1 which coacts with a brake chain 1' that is attached at one end for example, by soldering to a Hat spring 8 mounted on the uppermost disk of the frame a and at the other end to one arm t of a lever t, u pivoted at o, '2) on the brackets 7a, This chain preferably takes one turn round the pulley Q as shown.
The thermally expansible strip w, which may consist of watch spring, is provided at its ends with eyes as, 03, one of which engages with a hook or pin y on an insulated terminal 2 mounted on the uppermost disk of the lamp frame, the other eye engaging with a hook or pin 3 on the arm a of the lever t, u. The middle part of the strip 10 extends over a pulley 4L of insulating material, 6. g. porcelain, which is rotatably mounted in a fork 5 provided with a screw threaded extension 6 that extends through a hole in the lower frame-disk and coacts with a wing nut 7 whereby the tension of the strip m can be readily adjusted. The strip '20 is thus arranged in two slightly convergent limbs and can be very readily removed by slacking the nut 7 and unhooking the eyes m, a: from the pins 7 3. The end of the lever-arm a to which the strip to is attached preferably made in the form of a circular are substantially concentric with the pivots o of the lever 1, u, so as to increase the contact surface of said strip on said arm and to enable the pull of the strip to on the lever f. u, always to take place at substantially the same distance from the axis 4), a). The lever-arm 25 is acted upon by a spring 8 in such a manner as to keep the strip in in tension. The lower end of the spring 8 is secured to a sm'ew-threaded bolt extending through a hole in the lower frame-disk and provided with a wing nut 9, so as to enable the tension of the spring to be conveniently adjusted as required.
The operation of my improved arc lamp as follows: Assuming the relative tensions of the cold strip '10 and spring 8 to be such that the brake-chain r releases the pulley Q and allows the upper carbon to rest on the lower carbon, when current is supplied to the terminals 7, 2, it first heats the strip 10 and causes it to expand, so as to allow the spring 8 to pull down the arm t of the lever t, a. By this means the lower end of the ln'ake-chain r is drawn down and the said chain grips and turns the pulley Q and its arbor, thereby turning the pulley m in the direction to separate the carbons and strike the arc, the spring a meanwhile maintaining the tension in the chain 1' and yielding as required. As the carbons burn away, the current falls, the strip to cools and contracts, allowing the pulleys to turn in the reverse direction so to bring the carbons together and ultimately allow the pulley q to slip in the loop of chain r. After this, the current increases, the strip 10 expands and the above described operations are repeated. In order to short circuit the strip w when the current becomes excessive, the insulated terminal 2 is provided with a spring contact tongue 10, the tree end of which during the normal operation of the lamp stands at a short distance from the spring s. When the pull on the bra ke-chain 1' due to the expansion of the strip exceeds a predetermined amount, the springs will be brought into contact with the tongue 10 and the strip '10 thereby short-circuited.
An electric contact 11 electrically connected to the terminal 7 is arranged on the side of the tongue 10 remote from the spring a and at ashort distance therefrom, By this means, if the strip to should break, the spring 8 is first drawn down into contact with the tongue 10 and then the tongue is brought into contact with the contact 11 whereupon the lamp is entirely short-oircuited.
hat I claim is 1. The combination, in an arc lamp, of an insulated terminal, a thermally expansible metal strip connected at one end to said insulated terminal and. arranged in series with the arc, arc-controlling mechanism actuated by said strip, a switch comprising two spring members, electrical connections between the ends of said strip and said spring members respectively, a connection between said arc-controlling mechanism and one of said spring members whereby the switch is closed to short-circuit said strip independently of the are when the arc-controlling mechanism moved beyond a predetermined distance in separating the carbons, and a fixed contact connected to the other terminal of the lamp and arranged adjacent to the spring member which is connected to the insulated terminal of the lamp, so that when said expansible strip breaks, this spring member will be moved into contact with said fixed contact, substantially as described.
2. The combination, in an arc lamp, of a thermally-expansible metal strip arranged in series with the are, adjustable means for maintaining said strip in tension, a brakeband connected atone end to said tensioning means, a spring coacting with the other end of said brake-band, a brakenilley coacting with said brake-band, carbon-teed 1necln1nism controlled by said brakc- ')ulley, a yielding contact electrically connected. to one end of said expansible strip at one terminal of the lamp and arranged adjacent to said spring, an electrical connection between said spring and the other end of said expansible strip, a second stationary contact arranged on the side of said yielding contact remote from said spring and connected to the other terminal of the lamp.
In testimony whereof I have hereunto set my hand in presence of two subscribing witncsses.
RICHARD PHILIP M YE t8.
lVitnesses G110. HARRISON, E. SLADE TEMPLETON.
US38506507A 1907-07-22 1907-07-22 Arc-lamp. Expired - Lifetime US902990A (en)

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